To be clear, I am not proposing using volume shadow copies.
One should be taking full system image backups using the third-party tool of one's choosing, which is what Microsoft recommends, as well as parallel separate user data backups, which can be using that same third-party tool or Microsoft's own File History if running Windows 8.1 or 10.
System Protection (of which System Restore is a part) has never been intended as a full-recovery utility (which would include user data) and is notoriously flaky. It's focus is allowing the system to be rolled back in the event that, for instance, a bad new driver were installed that breaks something. It rolls back the state of the system registry and certain underlying support folders in the Windows hierarchy. It, as Jackie has already noted, has never, ever been involved in user data backup or recovery.
Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363
Power is being told you're not loved and not being destroyed by it.